Environmentally friendly concrete release agent and preparation method thereof

Abstract

The present application relates to the field of concrete materials, and specifically discloses an environmentally friendly concrete release agent and a preparation method thereof. An environmentally friendly concrete release agent comprises the following raw materials in parts by weight: 30-45 parts of castor oil, 3-7 parts of emulsifier, 0.5-2 parts of polyethylene glycol, 2-4 parts of isopropanol, 3-5 parts of bentonite, 2-6 parts of rust inhibitor, 40-50 parts of water, 2-4 parts of isocyanate, and 5-8 parts of silane coupling agent. An environmentally friendly concrete release agent of the present application uses castor oil as the main component of the release agent, polyethylene glycol can form a film for protection, isopropanol and bentonite can play a role in defoaming, and under the mutual cooperation of each component, the demoulding performance of the release agent is improved, the release agent is reduced from adhering to the surface of the concrete, and the influence of bubbles on the concrete is reduced, so that the concrete surface is smooth, clean, and has no color difference.

Description

Technical Field

[0001] The present application relates to the field of concrete materials, and more specifically, to an environmentally friendly concrete release agent and a preparation method thereof. Background Art

[0002] Precast concrete components need to be formed using molds. Before pouring concrete, a layer of release agent needs to be applied to the construction formwork to reduce the adhesion between the concrete and the formwork, to prevent the formwork from sticking to the surface of the concrete after pouring, making it difficult to remove the formwork, and affecting the surface finish of the concrete. An isolation film is formed between the formwork and the concrete surface to separate the two.

[0003] Traditional release agents are mainly pure oil release agents, and their working principle is mainly lubrication and isolation. However, in use, people have found that pure oil release agents are easy to adhere to the surface of concrete, causing the concrete to be contaminated, thereby causing defects, color differences and oil stains on the concrete surface, reducing the durability of the concrete. In addition, in order to reduce costs, current technology often uses waste engine oil as a release agent in pure oil release agents, which is easy to contaminate the surface of concrete and the environment, which is not conducive to environmental protection. Summary of the invention

[0004] In order to reduce the pollution of the release agent to concrete, the present application provides an environmentally friendly release agent for concrete and a preparation method thereof.

[0005] In the first aspect, the present application provides an environmentally friendly concrete release agent, which adopts the following technical solution:

[0006] An environmentally friendly concrete release agent comprises the following raw materials in parts by weight: 30-45 parts of castor oil, 3-7 parts of emulsifier, 0.5-2 parts of polyethylene glycol, 2-4 parts of isopropanol, 3-5 parts of bentonite, 2-6 parts of rust inhibitor, 40-50 parts of water, 2-4 parts of isocyanate and 5-8 parts of silane coupling agent.

[0007] By adopting the above technical scheme, the formed emulsion water-based release agent is environmentally friendly and pollution-free, has a low surface tension, can reduce the surface tension of bubbles, and promote the bursting of bubbles. After the release agent forms a film on the mold surface, the covering power is low, and the bubbles are easily discharged, reducing the bubbles on the surface of the concrete appearance. Castor oil has excellent low-temperature flow properties and storage stability. The castor oil is emulsified by an emulsifier to improve the uniformity of the release agent system, so that the release agent has certain low-temperature resistance and stability. The castor oil is modified by isocyanate and silane coupling agent, so that the castor oil and the steel plate mold have good adhesion, reduce the adhesion of the release agent to the surface of the concrete, and reduce the phenomenon of the release agent polluting the concrete.

[0008] Polyethylene glycol can form a continuous, transparent protective film with a certain strength on the steel plate mold. It has a certain lubricity and non-corrosiveness, which can facilitate the smooth demoulding of concrete during construction, and make the demoulding concrete intact and smooth. It can also prevent rust and protect the steel plate mold. Isopropyl alcohol added to the release agent can reduce the surface tension of the liquid, making the foam in the release agent easy to break, thereby achieving the effect of defoaming, and promoting the release agent to form a dense and smooth film layer on the mold, reducing the adhesion of bubbles on the concrete surface. Bentonite is added to the release agent system. Bentonite has hysteresis expansion and low surface tension. In the release agent system, bentonite can expand appropriately. The expanded particles are embedded in the bubble liquid film, which can promote the local separation and rupture of bubbles, thereby achieving the effect of defoaming, making the concrete surface flat and clean, and reducing the color difference on the concrete surface.

[0009] Preferably, the rust inhibitor comprises triethanolamine and benzotriazole, and the mass ratio of triethanolamine to benzotriazole is 1:0.02-0.03.

[0010] By adopting the above technical solution, the nitrogen atom in the triethanolamine molecule contains an unshared electron pair, which combines with the metal surface to form a coordination bond, adsorbs on the metal surface, and forms a protective film on the metal surface. At the same time, the nitrogen atom in the triethanolamine molecule also has a certain steric hindrance effect, which plays a certain shielding and isolating effect on the metal surface, thereby achieving an anti-rust effect on the steel plate mold. Adding an appropriate amount of benzotriazole can reduce the corrosion of copper molds and further improve the anti-rust performance of the release agent.

[0011] Preferably, the release agent raw material also includes 5-8 parts of fumaric acid and 6-10 parts of propylene oxide.

[0012] By adopting the above technical solution, fumaric acid can react with triethanolamine to undergo an esterification reaction under certain conditions, thereby improving the lubrication and anti-rust properties of the release agent, improving the release effect of the release agent, and reducing the phenomenon of the release agent adhering to the concrete surface. Propylene oxide is added to the release agent system, and after fumaric acid and triethanolamine react to form a complex, propylene oxide reacts with the complex to introduce polar groups and form side chains, thereby achieving a defoaming effect and further improving the defoaming performance of the release agent.

[0013] At the same time, the reaction of fumaric acid and triethanolamine can promote the hydroxyl groups on the side chain of triethanolamine to produce hydrogen bonds with water molecules, forming a certain hydration film, promoting a certain lubrication effect between the concrete and the release agent, improving the leveling performance of the concrete on the mold, and further improving the demolding effect of the release agent.

[0014] Preferably, the release agent raw material also includes 3-5 parts of carboxymethyl cellulose and 5-10 parts of chlorosulfonic acid.

[0015] By adopting the above technical solution, carboxymethyl cellulose is added to the release agent, which can play a role in thickening, dispersing and stabilizing, improve the adhesion between the components of the release agent system, promote better bonding of the release agent to the mold, reduce the phenomenon of release agent stratification, improve the uniformity of the release agent, and promote the release agent to be evenly applied to the steel plate mold. Chlorosulfonic acid reacts with carboxymethyl cellulose, promoting the carboxymethyl cellulose to be evenly dispersed in the release agent system, and at the same time firmly adsorbed on the surface of the steel plate mold, further improving the uniformity and storage stability of the release agent.

[0016] Preferably, the emulsifier is a mixture of an aqueous emulsifier and an oily emulsifier in a mass ratio of 1:0.5-0.8, the aqueous emulsifier is alkylphenol polyoxyethylene ether, and the oily emulsifier is sorbitan oleate.

[0017] By adopting the above technical scheme, by compounding a lipophilic emulsifier and a hydrophilic emulsifier, under the action of the compound emulsifier, oil and water are fully miscible, which promotes the relative balance of the components in the release agent system, reduces the stratification phenomenon of the release agent, and improves the storage stability of the release agent.

[0018] Preferably, the bentonite particle size is 0.1 mm-0.6 mm.

[0019] By adopting the above technical solution and controlling the bentonite particle size within a suitable range, the bentonite can be evenly dispersed in the release agent system, the agglomeration of the bentonite particles can be reduced, and the generation of bubbles in the release agent can be further reduced.

[0020] In a second aspect, the present application provides a method for preparing an environmentally friendly concrete release agent, which adopts the following technical solution:

[0021] A method for preparing an environmentally friendly concrete release agent comprises the following specific steps:

[0022] Isocyanate and castor oil are mixed in advance and reacted at 80-90°C to form modified castor oil, and then the modified castor oil is mixed with a silane coupling agent at a constant temperature to react to form a modified castor oil complex;

[0023] The modified castor oil compound and the emulsifier are mixed, and then sequentially mixed with polyethylene glycol, isopropyl alcohol, bentonite, rust inhibitor and water to prepare an environmentally friendly concrete release agent.

[0024] By adopting the above technical solution, the prepared release agent has the characteristics of low temperature resistance, environmental protection and low bubbles. Castor oil is used as the main component of the release agent, which makes the release agent have excellent gloss and lubricity, reduces the pollution between the release agent and concrete, and makes the surface of the concrete smooth, clean and colorless after demoulding.

[0025] Preferably, fumaric acid and triethanolamine are mixed in advance, heated to 100-110°C, and then concentrated sulfuric acid is added to react to obtain a fumaric acid-triethanolamine composite liquid, and then the fumaric acid-triethanolamine composite liquid is cooled to 70-80°C, propylene oxide is added, and the reaction is carried out at a constant temperature to obtain a modified triethanolamine complex, which is then mixed with benzotriazole to form a rust inhibitor, which is added to the release agent and mixed and stirred.

[0026] By adopting the above technical scheme, triethanolamine is modified by reaction with fumaric acid to improve the anti-rust and lubricating properties of the release agent, and propylene oxide is used to reduce the generation of bubbles in the reaction between fumaric acid and triethanolamine, thereby further improving the defoaming performance of the release agent and facilitating the cleaning of the release agent after the steel plate mold is used.

[0027] Preferably, carboxymethyl cellulose and chlorosulfonic acid are mixed and reacted in advance to form a mixed solution, and then a dispersant is added to the mixed solution, and then the pH value of the mixed solution is adjusted to neutral to obtain a carboxymethyl cellulose-chlorosulfonic acid complex, and then the carboxymethyl cellulose-chlorosulfonic acid complex, a modified castor oil complex and an emulsifier are mixed to form a release agent mixed solution, and then polyethylene glycol, isopropyl alcohol, bentonite, a rust inhibitor and water are sequentially added to the mixed solution and mixed and stirred to obtain an environmentally friendly concrete release agent.

[0028] By adopting the above technical scheme, chlorosulfonic acid can be grafted with carboxymethyl cellulose, thereby improving the wettability between carboxymethyl cellulose and the steel plate mold, promoting the release agent to be firmly bonded to the surface of the mold, and promoting the prepared release agent to have excellent dispersion stability and storage stability.

[0029] In summary, this application has the following beneficial effects:

[0030] 1. Since castor oil is used as the main component of the release agent in this application, the prepared release agent has the advantages of excellent low temperature resistance, gloss lubricity and environmental protection. Isocyanic acid and silane coupling agents are used to modify castor oil to improve the bonding force between the release agent and the steel plate mold, so that the release agent is firmly bonded to the mold and the phenomenon of the release agent adhering to the concrete surface is reduced.

[0031] 2. In this application, polyethylene glycol is used to protect the components in the release agent system by film formation, so that the release agent forms a flat and smooth film on the surface of the mold, which enables the concrete mold to be demolded smoothly, protects the concrete from being contaminated by the release agent, and protects the mold from corrosion. Isopropyl alcohol and bentonite are added to the release agent system to reduce the generation of bubbles and improve the defoaming performance of the release agent, thereby making the concrete flat, free of color difference and bubbles after demolding.

[0032] 3. The present application improves the anti-rust performance of the release agent by using triethanolamine and benzotriazole in combination, and modifies triethanolamine with fumaric acid and propylene oxide to improve the durability of the anti-rust effect of the release agent. At the same time, propylene oxide can also reduce the generation of bubbles. DETAILED DESCRIPTION

[0033] The present application is further described in detail below in conjunction with embodiments.

[0034] In this specific embodiment, without other special circumstances, the components used are as follows:

[0035] The polyethylene glycol selected has a molecular weight of 12,000.

[0036] The silane coupling agent is KH-550.

[0037] The isocyanate selected is phorone diisocyanate.

[0038] Example

[0039] Example 1

[0040] An environmentally friendly concrete release agent comprises the following raw materials in parts by weight: 38 kg of castor oil, 5 kg of emulsifier, 1.2 kg of polyethylene glycol, 3 kg of isopropyl alcohol, 4 kg of bentonite, 4 kg of rust inhibitor, 45 kg of water, 3 kg of isocyanate, and 6.5 kg of silane coupling agent. The emulsifier is a mixture of an aqueous emulsifier and an oily emulsifier in a mass ratio of 1:0.65, the rust inhibitor is a mixture of triethanolamine and benzotriazole in a mass ratio of 1:0.25, and the particle size of the bentonite is 0.3 mm-0.4 mm.

[0041] A method for preparing an environmentally friendly concrete release agent comprises the following specific steps:

[0042] S1: mixing isocyanate and castor oil, heating to 85°C for reaction for 2 hours to generate modified castor oil, and then mixing the modified castor oil with a silane coupling agent at a constant temperature for reaction for 2 hours to generate a modified castor oil complex;

[0043] S2: The modified castor oil compound and the emulsifier are mixed, stirred at a speed of 800 r / min for 10 minutes, and then sequentially mixed with polyethylene glycol, isopropyl alcohol, bentonite, triethanolamine, benzotriazole and water, and stirred at a speed of 1000 r / min for 20 minutes to obtain an environmentally friendly concrete release agent.

[0044] Example 2-3

[0045] The difference between Example 2-3 and Example 1 is that the contents of the components in the release agent raw materials are different, as shown in Table 1 for details.

[0046] Table 1: Content of each component in the release agent raw material in Examples 1-3 Example 4

[0047] The difference between Example 4 and Example 1 is that the emulsifier in the release agent raw material is a mixture of an aqueous emulsifier and an oily emulsifier in a mass ratio of 1:0.5, the rust inhibitor is a mixture of triethanolamine and benzotriazole in a mass ratio of 1:0.03, and the particle size of the bentonite is 0.1mm-0.2mm.

[0048] Example 5

[0049] The difference between Example 5 and Example 1 is that the emulsifier in the release agent raw material is a mixture of an aqueous emulsifier and an oily emulsifier in a mass ratio of 1:0.8, the rust inhibitor is a mixture of triethanolamine and benzotriazole in a mass ratio of 1:0.02, and the particle size of the bentonite is 0.5mm-0.6mm.

[0050] Example 6

[0051] The difference between Example 6 and Example 1 is that the release agent raw materials also include 7 kg of fumaric acid and 8 kg of propylene oxide.

[0052] The preparation method of the environmentally friendly concrete release agent comprises the following specific steps:

[0053] S1: Heat fumaric acid to 80°C, then mix fumaric acid and triethanolamine and heat to 100°C, then add concentrated sulfuric acid and seal to react for 6 hours, the mass ratio of concentrated sulfuric acid to fumaric acid is 0.01:1, and obtain fumaric acid-triethanolamine composite liquid, then cool the fumaric acid-triethanolamine composite liquid to 80°C, add propylene oxide and triethylenetetramine, and react at a constant temperature of 80°C for 1 hour to obtain a modified triethanolamine complex.

[0054] S2: mixing isocyanate and castor oil, heating to 85°C for reaction for 2 hours to generate modified castor oil, and then mixing the modified castor oil with a silane coupling agent at a constant temperature for reaction for 2 hours to generate a modified castor oil complex;

[0055] S3: The modified castor oil compound and the emulsifier are mixed, stirred at a speed of 800 r / min for 10 minutes, and then sequentially mixed with polyethylene glycol, isopropyl alcohol, bentonite, modified triethanolamine compound, benzotriazole and water, and stirred at a speed of 1000 r / min for 20 minutes to obtain an environmentally friendly concrete release agent.

[0056] Example 7

[0057] The difference between Example 7 and Example 6 is that the amount of fumaric acid used in the release agent raw material is 5 kg, and the amount of propylene oxide used is 10 kg.

[0058] Example 8

[0059] The difference between Example 8 and Example 6 is that the amount of fumaric acid used in the release agent raw material is 8 kg, and the amount of propylene oxide used is 6 kg.

[0060] Example 9

[0061] The difference between Example 9 and Example 6 is that the release agent raw materials also include 4 kg of carboxymethyl cellulose and 8 kg of chlorosulfonic acid.

[0062] The preparation method of the environmentally friendly concrete release agent comprises the following specific steps:

[0063] S1: Carboxymethyl cellulose and chlorosulfonic acid were mixed, stirred at a speed of 300 r / min for 15 minutes to form a mixed solution, and then a dispersant was added to the mixed solution, stirred at a speed of 300 r / min for 3 hours, and then the pH value of the mixed solution was adjusted to neutral with sodium hydroxide. Finally, the reactants were washed with anhydrous ethanol and dried at 40°C to obtain a carboxymethyl cellulose-chlorosulfonic acid complex.

[0064] S2: Heat fumaric acid to 80°C, then mix fumaric acid and triethanolamine and heat to 100°C, then add concentrated sulfuric acid and seal to react for 6 hours, the mass ratio of concentrated sulfuric acid to fumaric acid is 0.01:1, to obtain a fumaric acid-triethanolamine composite liquid, then cool the fumaric acid-triethanolamine composite liquid to 80°C, add propylene oxide and triethylenetetramine, and react at a constant temperature of 80°C for 1 hour to obtain a modified triethanolamine complex.

[0065] S3: Mix isocyanate and castor oil, heat to 85°C and react for 2 hours to generate modified castor oil, then mix the modified castor oil with a silane coupling agent at a constant temperature and react for 2 hours to generate a modified castor oil complex.

[0066] S4: The modified castor oil complex and the emulsifier are mixed, stirred at a speed of 800 r / min for 10 minutes, and then sequentially mixed with the carboxymethyl cellulose-chlorosulfonic acid complex, polyethylene glycol, isopropyl alcohol, bentonite, modified triethanolamine complex, benzotriazole and water, and stirred at a speed of 1000 r / min for 20 minutes to obtain an environmentally friendly concrete release agent.

[0067] Example 10

[0068] The difference between Example 10 and Example 9 is that the amount of carboxymethyl cellulose used in the release agent raw material is 5 kg, and the amount of chlorosulfonic acid used is 10 kg.

[0069] Embodiment 11

[0070] The difference between Example 11 and Example 9 is that the amount of carboxymethyl cellulose used in the release agent raw material is 3 kg, and the amount of chlorosulfonic acid used is 5 kg.

[0071] Example 12

[0072] The difference between Example 12 and Example 9 is that chlorosulfonic acid is not used in the release agent raw material.

[0073] The preparation method of the environmentally friendly concrete release agent comprises the following specific steps:

[0074] S1: Heat fumaric acid to 80°C, then mix fumaric acid and triethanolamine and heat to 100°C, then add concentrated sulfuric acid and seal to react for 6 hours, the mass ratio of concentrated sulfuric acid to fumaric acid is 0.01:1, and obtain fumaric acid-triethanolamine composite liquid, then cool the fumaric acid-triethanolamine composite liquid to 80°C, add propylene oxide and triethylenetetramine, and react at a constant temperature of 80°C for 1 hour to obtain a modified triethanolamine complex.

[0075] S2: Mix isocyanate and castor oil, heat to 85°C and react for 2 hours to generate modified castor oil, then mix the modified castor oil with a silane coupling agent at a constant temperature and react for 2 hours to generate a modified castor oil complex.

[0076] S3: The modified castor oil complex and the emulsifier are mixed, stirred at a speed of 800 r / min for 10 minutes, and then mixed with carboxymethyl cellulose, polyethylene glycol, isopropyl alcohol, bentonite, modified triethanolamine complex, benzotriazole and water in sequence, and stirred at a speed of 1000 r / min for 20 minutes to obtain an environmentally friendly concrete release agent.

[0077] Comparative Example

[0078] Comparative Example 1

[0079] The difference between Comparative Example 1 and Example 1 is that bentonite is not used in the raw material of the release agent.

[0080] Comparative Example 2

[0081] The difference between Comparative Example 2 and Example 1 is that isopropyl alcohol is not used in the release agent raw material.

[0082] Comparative Example 3

[0083] The difference between Comparative Example 3 and Example 1 is that the rust inhibitor in the release agent raw material is triethanolamine.

[0084] Performance testing

[0085] The following performance tests were conducted on the environmentally friendly concrete release agents provided in Examples 1-12 and Comparative Examples 1-3 of the present application, as shown in Table 2.

[0086] Detection Methods

[0087] 1. Demolding performance

[0088] Refer to the 4.3 construction performance test standard in the JC / T949-2005 "Release Agents for Concrete Products" standard to test the adhesion of concrete and the appearance of concrete after successful demoulding.

[0089] 2. Anti-rust performance

[0090] Refer to the standard 5.9 on the effect of steel mold corrosion in the JC / T949-2005 "Release Agents for Concrete Products" standard to test the anti-rust ability of the release agent.

[0091] 3. Stability

[0092] With reference to 5.5 Stability in the standard JC / T949-2005 "Release Agent for Concrete Products", the release agent prepared in this application was diluted to a concentration of 0.02 g / mL as an experimental sample, and allowed to stand for 24 hours at 25°C to observe whether the test sample was uniform and whether there was any stratification under natural light.

[0093] 4. Porosity

[0094] Use a digital camera to photograph the front and back sides of the 100x100mm concrete after demoulding, and use image-proplus6.0 to process the pictures taken by the digital camera. The porosity of the concrete surface is the ratio of the sum of the pore areas on the concrete surface to the total area of ​​the concrete.

[0095] Table 2: Performance test data table

[0096]

[0097]

[0098] It can be seen from the performance test results of Examples 1-5 that the castor oil used in the release agent prepared by the present application is emulsified with an emulsifier, and has the characteristics of environmental protection, low temperature resistance, and storage stability, and also has excellent demoulding performance. Polyethylene glycol is also used to form a continuous and smooth film layer on the surface of the mold, which makes the concrete intact and smooth after demoulding, and can also play a role in rust prevention and protection of the mold. Castor oil is modified by isocyanate and silane coupling agent to promote better bonding between the release agent and the mold, thereby reducing the adhesion of the release agent to the concrete. In Examples 1-5, the amount of each component used in the release agent raw material is different. It can be seen from the performance test results that the comprehensive performance of Example 1 is better.

[0099] By comparing the performance test results of Example 1 with those of Comparative Examples 1 and 2, it can be seen that the present application uses bentonite and isopropyl alcohol to compound, which promotes the bursting of bubbles during concrete casting, makes the concrete surface flat and clean, and has no bubble adhesion, thereby reducing the color difference of the concrete caused by bubbles. However, Comparative Example 1 does not use bentonite, and Comparative Example 2 does not use isopropyl alcohol. As can be seen from the performance test results, the porosity of the release agent increases, and bubbles adhere to the concrete surface, causing the formation of color difference on the concrete surface.

[0100] From the performance test results of Example 1 and Comparative Example 3, it can be seen that the present application uses triethanolamine and benzotriazole to be compounded and adsorbed on the surface of the metal mold to form a protective film on the surface of the mold, which plays a role in rust prevention and oxygen isolation on the surface of the mold. At the same time, the use of an appropriate amount of benzotriazole can reduce the corrosion of the copper mold and enhance the rust prevention effect of the mold release agent on the mold. In Comparative Example 3, benzotriazole is not used. From the performance test results, it can be seen that the rust prevention effect of the mold release agent is significantly reduced.

[0101] It can be seen from Examples 6-8 that by adding different amounts of fumaric acid and propylene oxide to the release agent system, the release performance of the release agent is improved, as shown in the performance test results. Fumaric acid can enhance the wettability and bonding strength between triethanolamine and the mold, while propylene oxide can destroy the generation of bubbles in the release agent, thereby achieving a defoaming effect, and thus the porosity of the concrete will also decrease.

[0102] As shown in Examples 9-11, different amounts of carboxymethyl cellulose and chlorosulfonic acid are added to the release agent system. As shown in the performance test results, the demoulding performance of the release agent is improved, and the release agent is more uniform. Carboxymethyl cellulose plays a role of thickening and stabilizing dispersion in the release agent, which is convenient for the release agent to be better applied on the mold. Chlorosulfonic acid can promote the carboxymethyl cellulose to be more evenly distributed in the release agent system, improve the bonding force between the release agent and the mold, and further improve the demoulding performance of the release agent. And chlorosulfonic acid is not used in Example 12. As shown in the performance test results, the demoulding performance of the release agent prepared in Example 9 is better, indicating that the modification of carboxymethyl cellulose by chlorosulfonic acid further improves the demoulding performance of the release agent. Compared with a single carboxymethyl cellulose, the mutual combination of chlorosulfonic acid and carboxymethyl cellulose can better improve the uniformity and storage stability of the release agent.

[0103] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. An environmentally friendly concrete release agent, characterized in that: The invention comprises the following raw materials in parts by weight: 30-45 parts of castor oil, 3-7 parts of emulsifier, 0.5-2 parts of polyethylene glycol, 2-4 parts of isopropanol, 3-5 parts of bentonite, 2-6 parts of rust inhibitor, 40-50 parts of water, 2-4 parts of isocyanate, 5-8 parts of silane coupling agent, 5-8 parts of fumaric acid, 6-10 parts of propylene oxide, 3-5 parts of carboxymethyl cellulose and 5-10 parts of chlorosulfonic acid; the rust inhibitor comprises triethanolamine and benzotriazole, and the mass ratio of triethanolamine to benzotriazole is a mixture of 1:0.02-0.03; The emulsifier is a mixture of an aqueous emulsifier and an oily emulsifier in a mass ratio of 1:0.5-0.8, the aqueous emulsifier is alkylphenol polyoxyethylene ether, and the oily emulsifier is sorbitan oleate; The method for preparing the environmentally friendly concrete release agent comprises the following specific steps: Isocyanate and castor oil are mixed in advance and reacted at 80-90°C to form modified castor oil, and then the modified castor oil is mixed with a silane coupling agent at a constant temperature to react to form a modified castor oil complex; Mix fumaric acid and triethanolamine in advance, heat to 100-110°C, then add concentrated sulfuric acid to react, to obtain a fumaric acid-triethanolamine composite liquid, then cool the fumaric acid-triethanolamine composite liquid to 70-80°C, add propylene oxide, react at a constant temperature, to obtain a modified triethanolamine complex, and then mix with benzotriazole to form a rust inhibitor; The modified castor oil compound and the emulsifier are mixed, and then sequentially mixed with polyethylene glycol, isopropyl alcohol, bentonite, rust inhibitor and water to prepare an environmentally friendly concrete release agent.

2. The environmentally friendly concrete release agent according to claim 1, characterized in that: The bentonite particle size is 0.1mm-0.6mm.

3. The environmentally friendly concrete release agent according to claim 1, characterized in that: Carboxymethyl cellulose and chlorosulfonic acid are mixed and reacted in advance to form a mixed solution, and then a dispersant is added to the mixed solution, and then the pH value of the mixed solution is adjusted to neutral to obtain a carboxymethyl cellulose-chlorosulfonic acid complex, and then the carboxymethyl cellulose-chlorosulfonic acid complex, a modified castor oil complex and an emulsifier are mixed to form a release agent mixed solution, and then polyethylene glycol, isopropyl alcohol, bentonite, a rust inhibitor and water are added to the mixed solution in sequence and mixed and stirred to obtain an environmentally friendly concrete release agent.

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